Those of us over the age of 12 of course know where this meme ~actually~ originated from and were using it (and other forms of it) for decades before the /b/tard kiddies had ever even heard of it. The original follows the line of "X in bed." and was originally used to make the fortunes in fortune cookies more interesting. Leave it to the /b/tards to take something funny and fuck it all up.

As stated before, put the phrase "in your pants" at the end of a song title. Generally, this will automatically make it funny. It's best to make fun of popular songs, like some that have been in Guitar Hero games (Prototype ~ The Way it Ends (in my pants)), or any song that has the word "girl" in it (Little Girls In My Pants).

However this meme can become disgusting if applied to certain songs. To name a few: